const Declaration = require('./declaration');
const Resolution = require('./resolution');
const Transition = require('./transition');
const Processor = require('./processor');
const Supports = require('./supports');
const Browsers = require('./browsers');
const Selector = require('./selector');
const AtRule = require('./at-rule');
const Value = require('./value');
const utils = require('./utils');

const vendor = require('postcss').vendor;

Selector.hack(require('./hacks/fullscreen'));
Selector.hack(require('./hacks/placeholder'));

Declaration.hack(require('./hacks/flex'));
Declaration.hack(require('./hacks/order'));
Declaration.hack(require('./hacks/filter'));
Declaration.hack(require('./hacks/grid-end'));
Declaration.hack(require('./hacks/animation'));
Declaration.hack(require('./hacks/flex-flow'));
Declaration.hack(require('./hacks/flex-grow'));
Declaration.hack(require('./hacks/flex-wrap'));
Declaration.hack(require('./hacks/grid-area'));
Declaration.hack(require('./hacks/grid-start'));
Declaration.hack(require('./hacks/align-self'));
Declaration.hack(require('./hacks/appearance'));
Declaration.hack(require('./hacks/flex-basis'));
Declaration.hack(require('./hacks/mask-border'));
Declaration.hack(require('./hacks/align-items'));
Declaration.hack(require('./hacks/flex-shrink'));
Declaration.hack(require('./hacks/break-props'));
Declaration.hack(require('./hacks/writing-mode'));
Declaration.hack(require('./hacks/border-image'));
Declaration.hack(require('./hacks/align-content'));
Declaration.hack(require('./hacks/border-radius'));
Declaration.hack(require('./hacks/block-logical'));
Declaration.hack(require('./hacks/grid-template'));
Declaration.hack(require('./hacks/inline-logical'));
Declaration.hack(require('./hacks/grid-row-align'));
Declaration.hack(require('./hacks/transform-decl'));
Declaration.hack(require('./hacks/flex-direction'));
Declaration.hack(require('./hacks/image-rendering'));
Declaration.hack(require('./hacks/text-decoration'));
Declaration.hack(require('./hacks/justify-content'));
Declaration.hack(require('./hacks/background-size'));
Declaration.hack(require('./hacks/grid-row-column'));
Declaration.hack(require('./hacks/grid-rows-columns'));
Declaration.hack(require('./hacks/grid-column-align'));
Declaration.hack(require('./hacks/overscroll-behavior'));
Declaration.hack(require('./hacks/grid-template-areas'));
Declaration.hack(require('./hacks/text-emphasis-position'));

Value.hack(require('./hacks/gradient'));
Value.hack(require('./hacks/intrinsic'));
Value.hack(require('./hacks/pixelated'));
Value.hack(require('./hacks/image-set'));
Value.hack(require('./hacks/cross-fade'));
Value.hack(require('./hacks/display-flex'));
Value.hack(require('./hacks/display-grid'));
Value.hack(require('./hacks/filter-value'));

const declsCache = {};

class Prefixes {

    constructor(data, browsers, options = {}) {
        this.data = data;
        this.browsers = browsers;
        this.options = options;
        [this.add, this.remove] = this.preprocess(this.select(this.data));
        this.transition = new Transition(this);
        this.processor = new Processor(this);
    }

    /**
     * Return clone instance to remove all prefixes
     */
    cleaner() {
        if (this.cleanerCache) {
            return this.cleanerCache;
        }

        if (this.browsers.selected.length) {
            const empty = new Browsers(this.browsers.data, []);
            this.cleanerCache = new Prefixes(this.data, empty, this.options);
        } else {
            return this;
        }

        return this.cleanerCache;
    }

    /**
     * Select prefixes from data, which is necessary for selected browsers
     */
    select(list) {
        const selected = { add: {}, remove: {} };

        for (let name in list) {
            const data = list[name];
            let add = data.browsers.map(i => {
                const params = i.split(' ');
                return {
                    browser: `${params[0]} ${params[1]}`,
                    note: params[2]
                };
            });

            let notes = add
                .filter(i => i.note)
                .map(i => `${this.browsers.prefix(i.browser)} ${i.note}`);
            notes = utils.uniq(notes);

            add = add
                .filter(i => this.browsers.isSelected(i.browser))
                .map(i => {
                    const prefix = this.browsers.prefix(i.browser);
                    if (i.note) {
                        return `${prefix} ${i.note}`;
                    } else {
                        return prefix;
                    }
                });
            add = this.sort(utils.uniq(add));

            if (this.options.flexbox === 'no-2009') {
                add = add.filter(i => i.indexOf('2009') === -1);
            }

            let all = data.browsers.map(i => this.browsers.prefix(i));
            if (data.mistakes) {
                all = all.concat(data.mistakes);
            }
            all = all.concat(notes);
            all = utils.uniq(all);

            if (add.length) {
                selected.add[name] = add;
                if (add.length < all.length) {
                    selected.remove[name] = all.filter(
                        i => add.indexOf(i) === -1
                    );
                }
            } else {
                selected.remove[name] = all;
            }
        }

        return selected;
    }

    /**
     * Sort vendor prefixes
     */
    sort(prefixes) {
        return prefixes.sort((a, b) => {
            const aLength = utils.removeNote(a).length;
            const bLength = utils.removeNote(b).length;

            if (aLength === bLength) {
                return b.length - a.length;
            } else {
                return bLength - aLength;
            }
        });
    }

    /**
     * Cache prefixes data to fast CSS processing
     */
    preprocess(selected) {
        const add = {
            'selectors': [],
            '@supports': new Supports(Prefixes, this)
        };
        for (const name in selected.add) {
            const prefixes = selected.add[name];
            if (name === '@keyframes' || name === '@viewport') {
                add[name] = new AtRule(name, prefixes, this);

            } else if (name === '@resolution') {
                add[name] = new Resolution(name, prefixes, this);

            } else if (this.data[name].selector) {
                add.selectors.push(Selector.load(name, prefixes, this));

            } else {
                const props = this.data[name].props;

                if (props) {
                    const value = Value.load(name, prefixes, this);
                    for (const prop of props) {
                        if (!add[prop]) {
                            add[prop] = { values: [] };
                        }
                        add[prop].values.push(value);
                    }
                } else {
                    const values = add[name] && add[name].values || [];
                    add[name] = Declaration.load(name, prefixes, this);
                    add[name].values = values;
                }
            }
        }

        const remove = { selectors: [] };
        for (const name in selected.remove) {
            const prefixes = selected.remove[name];
            if (this.data[name].selector) {
                const selector = Selector.load(name, prefixes);
                for (const prefix of prefixes) {
                    remove.selectors.push(selector.old(prefix));
                }

            } else if (name === '@keyframes' || name === '@viewport') {
                for (const prefix of prefixes) {
                    const prefixed = `@${prefix}${name.slice(1)}`;
                    remove[prefixed] = { remove: true };
                }

            } else if (name === '@resolution') {
                remove[name] = new Resolution(name, prefixes, this);

            } else {
                const props = this.data[name].props;
                if (props) {
                    const value = Value.load(name, [], this);
                    for (const prefix of prefixes) {
                        const old = value.old(prefix);
                        if (old) {
                            for (const prop of props) {
                                if (!remove[prop]) {
                                    remove[prop] = {};
                                }
                                if (!remove[prop].values) {
                                    remove[prop].values = [];
                                }
                                remove[prop].values.push(old);
                            }
                        }
                    }
                } else {
                    for (const prefix of prefixes) {
                        const olds = this.decl(name).old(name, prefix);
                        if (name === 'align-self') {
                            const a = add[name] && add[name].prefixes;
                            if (a) {
                                if (prefix === '-webkit- 2009' &&
                                    a.indexOf('-webkit-') !== -1) {
                                    continue;
                                } else if (prefix === '-webkit-' &&
                                    a.indexOf('-webkit- 2009') !== -1) {
                                    continue;
                                }
                            }
                        }
                        for (const prefixed of olds) {
                            if (!remove[prefixed]) {
                                remove[prefixed] = {};
                            }
                            remove[prefixed].remove = true;
                        }
                    }
                }
            }
        }

        return [add, remove];
    }

    /**
     * Declaration loader with caching
     */
    decl(prop) {
        const decl = declsCache[prop];

        if (decl) {
            return decl;
        } else {
            declsCache[prop] = Declaration.load(prop);
            return declsCache[prop];
        }
    }

    /**
     * Return unprefixed version of property
     */
    unprefixed(prop) {
        let value = this.normalize(vendor.unprefixed(prop));
        if (value === 'flex-direction') {
            value = 'flex-flow';
        }
        return value;
    }

    /**
     * Normalize prefix for remover
     */
    normalize(prop) {
        return this.decl(prop).normalize(prop);
    }

    /**
     * Return prefixed version of property
     */
    prefixed(prop, prefix) {
        prop = vendor.unprefixed(prop);
        return this.decl(prop).prefixed(prop, prefix);
    }

    /**
     * Return values, which must be prefixed in selected property
     */
    values(type, prop) {
        const data = this[type];

        const global = data['*'] && data['*'].values;
        const values = data[prop] && data[prop].values;

        if (global && values) {
            return utils.uniq(global.concat(values));
        } else {
            return global || values || [];
        }
    }

    /**
     * Group declaration by unprefixed property to check them
     */
    group(decl) {
        const rule = decl.parent;
        let index = rule.index(decl);
        const { length } = rule.nodes;
        const unprefixed = this.unprefixed(decl.prop);

        const checker = (step, callback) => {
            index += step;
            while (index >= 0 && index < length) {
                const other = rule.nodes[index];
                if (other.type === 'decl') {

                    if (step === -1 && other.prop === unprefixed) {
                        if (!Browsers.withPrefix(other.value)) {
                            break;
                        }
                    }

                    if (this.unprefixed(other.prop) !== unprefixed) {
                        break;
                    } else if (callback(other) === true) {
                        return true;
                    }

                    if (step === +1 && other.prop === unprefixed) {
                        if (!Browsers.withPrefix(other.value)) {
                            break;
                        }
                    }
                }

                index += step;
            }
            return false;
        };

        return {
            up(callback) {
                return checker(-1, callback);
            },
            down(callback) {
                return checker(+1, callback);
            }
        };
    }

}

module.exports = Prefixes;
